There are a couple of different aspects to NPR that are important to understand. There are specific shows that you can pitch an idea to, and pitch a guest to, and there are individual correspondents that you can pitch to. When you're pitching to a show, it's important to realize whether it is a national show, meaning it is syndicated, and it's picked by most, if not all, of the NPR affiliates stations around the country. Or it could be a local show, something like Here and Now which is a local show on WBUR here in Boston, for example, or Forum, which is a wonderful show on KQED out of San Francisco. So in order to go through the maze that is National Public Radio, you have to first figure out whether a show is national or local, and you have to determine whether you really should be pitching a show, or an individual correspondent.

In order to find out more about pitching your show on National Public Radio you can check out How to Get Booked on National Public Radio.
http://101publicrelations.com/nationalpublicradio.html?utm_source=prideas&utm_content=npr